Quantifying the Safety Benefits of Transit Signal Priority Using Full Bayes Before–After Study

Ali, Sultan; Kitali, Angela E.; Kodi, John H.; Alluri, Priyanka; Sando, Thobias

doi:10.1061/jtepbs.0000620

Cited by 10 publications

(3 citation statements)

References 40 publications

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“…Since there is no study which has a similar set of analysis as the current study, the authors selected non-informative priors in the estimation of parameters. This approach has also been used in previous studies ( 12 – 18 ). The non-informative priors have a negligible influence on the estimates ( 11 ).…”

Section: Methodsmentioning

confidence: 99%

Impacts of COVID-19 on the Operational Performance of Express Lanes and General-Purpose Lanes

Kodi

Kitali

Kidando

et al. 2022

Transportation Research Record: Journal of the Transportation R

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The COVID-19 pandemic outbreak brought significant changes in the travel behavior and operational characteristics of transportation systems. Express lanes (ELs) are among the transportation facilities that are affected by this pandemic. These facilities are built adjacent to existing general-purpose lanes (GPLs), providing drivers additional lanes that are dynamically priced in response to changing traffic conditions. This research investigated the impacts of COVID-19 on the operational performance of ELs and GPLs based on field data from a 5.5 mi corridor on I-95 in Miami, Florida, U.S. The traffic flow parameters, which include speed, traffic flow, and occupancy, were used to describe the traffic conditions before and during COVID-19 (i.e., March–June 2019 and March–June 2020, respectively). The travel time reliability measures, coefficient of variation of travel time, and planning time index, were used to measure user satisfaction. These metrics were derived from a multivariate Bayesian additive regression model that was developed to calibrate the traffic conditions on the study corridor. Overall, the model results indicated that both ELs and GPLs have less variation in travel time, thus making the travel time more reliable during COVID-19 than before. This may be attributed to the decline in the traffic volume observed during the pandemic. The results further showed that COVID-19 had more impact on the GPLs compared with the ELs. The results from this research could assist transportation agencies in understanding the impacts of the COVID-19 pandemic on ELs and GPLs in relation to traffic operations.

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Section: Methodsmentioning

confidence: 99%

Impacts of COVID-19 on the Operational Performance of Express Lanes and General-Purpose Lanes

Kodi

Kitali

Kidando

et al. 2022

Transportation Research Record: Journal of the Transportation R

Self Cite

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“…Techniques equipped with passive priority to conduct transit traffic mainly include cycle length adjustment, phase splitting, increasing the phase duration, and vehicle metering. The active priority strategy [5,13], adjusts the signal timing plan based on the detection of the transit real-time arrival state. It belongs to the realtime priority strategy and needs more advanced information detection equipment to obtain the traffic conditions of motor vehicles and public transport in the road network [14].…”

Section: Tsp Controlmentioning

confidence: 99%

“…If the extended phase, that is, TP, meets the constraint first, the priority signal time is expressed as Equation (13).…”

Section: Green Time Extensionmentioning

confidence: 99%

A cooperative control method combining signal control and speed control for transit with connected vehicle environment

Teng,

Liu,

Liu

et al. 2023

IET Control Theory & Appl

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Transit operation efficiency and service quality can be enhanced through the implementation of signal and speed control. Previous studies prefer to change driving speed in priority to alleviate the adverse effects of signal timing adjustment on social vehicles. The driving safety and fuel consumption of transit are ignored. To this end, a cooperative control method consisting of three models is proposed. The cooperative control strategy model provides optimal schemes for allocating transit priority time. Based on this, the adjustment of phase time and the transit speed trajectory with the lower fuel consumption are calculated by signal control model and speed control model, respectively. Especially, the signal control model is established in the background of green wave coordinated control to further protect the travelling benefits of social vehicles. The simulation is performed in SUMO to demonstrate the effectiveness of the proposed method. The results show that the cooperative control method improves the crossing efficiency and enhances the fuel economy of transit under different arrival speeds and lengths of control area. Compared with the general signal control, the proposed method can minimize traffic interference, which is particularly obvious in a higher degree of saturation.

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Transferability of a calibrated microscopic simulation model parameters for operational assessment of transit signal priority

Ali¹,

Haule

Kodi³

et al. 2023

Public Transp

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Quantifying the Safety Benefits of Transit Signal Priority Using Full Bayes Before–After Study

Cited by 10 publications

References 40 publications

Impacts of COVID-19 on the Operational Performance of Express Lanes and General-Purpose Lanes

Impacts of COVID-19 on the Operational Performance of Express Lanes and General-Purpose Lanes

A cooperative control method combining signal control and speed control for transit with connected vehicle environment

Transferability of a calibrated microscopic simulation model parameters for operational assessment of transit signal priority

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